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9.6 <br />x <br />Tension <br />I Slope face VFilure Phreatic surface <br />H <br />h-- Assumed equipotentials <br />X ssumed flow lines <br />surface <br />Slope angle <br />a) Groundwater flow pattern under steady state <br />drawdown conditions where the phreatic surface <br />coincides with the ground surface at a distance <br />x behind the toe of the slope. The distance x <br />is measured in multiples of the slope height H. <br />Surface recharge due to heavy rain <br />ension crack <br />Failure surface <br />H <br /> <br />Assumed equipotentials <br />.. ?f <br />Assumed flow lines <br />?C \ -b) Groundwater flow pattern in a saturated slope <br />subjected to heavy surface recharge by heavy rain. <br />Figure 9.3 :'Definition of groundwater flow patterns used in circular failure <br />analysis of soil and waste rock slopes. <br />